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Research on Digital Watermarking Technology of MPEG-4 Video Based on DCT

Author: HanXiaoXiang
Tutor: ShiHuaJi
School: Jiangsu University
Course: Computer Applications
Keywords: Video digital watermarking Discrete Cosine Transform Digital Image Watermarking MPEG-4
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 120
Quote: 2
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Abstract


With the rapid development of computer technology and the Internet, the rapid application of digital media, digital watermarking technology plays an increasingly important role in the copyright protection of digital media, content authentication, use the control, digital watermarking research is also increasingly The deeper. This article focused on digital image watermark and video digital watermarking technology. This paper first discusses the background and significance of the research, and summarizes the current status quo. Then, on the model and algorithm of the digital watermark reviewed, on this basis, the existing DCT digital watermarking algorithm improved, a digital watermarking algorithm based on DCT. Finally, the static image watermarking method is introduced into the video watermark, and MPEG-4 video watermarking algorithm for real-time applications. This paper studies include: digital watermark technology Research analyzed, an overview of the knowledge of digital watermarking technology, digital watermarking framework and analysis of a typical digital watermarking algorithm and its application, as This study provides the basis. 2. An image watermarking algorithm based on DCT. Improve the existing DCT digital watermarking algorithms, the DCT coefficients of pixel block subdivision visual blockiness in reducing watermark embedding brought at the same time, making the the watermark calculation process in the need for high-level matrix computation becomes for the lower order matrix operation, which greatly improved the efficiency of the watermark generation and authentication. The experimental results show that the algorithm also has good anti-attack capability, is strong a robust algorithm. Proposed MPEG-4 video watermarking algorithm for real-time applications. Watermark embedding algorithm on the basis of the DCT domain, the I frame for the MPEG-4 video frames independent features, eliminating the need for video complete decoding to embed a watermark. This makes the watermark embedding computational complexity has been effectively reduced, to meet the requirements of real-time video watermarking. The experimental results show that the algorithm is guaranteed to enhance the efficiency of the watermarking watermark imperceptibility and robustness characteristics premise. Of course, the algorithm has a speed advantage, in terms of the density of the watermark embedding decreased, but for such networking sites need to quickly process a large number of video and embed watermark information scenarios for copyright protection, the algorithm will be a good options.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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